Surface enhanced Raman spectroscopy of Rhodamine 6G on agglomerates of different-sized silver truncated nanotriangles

Wu, Chunfang; Chen, Enzi; Wei, Jie

doi:10.1016/j.colsurfa.2016.07.020

Cited by 47 publications

(30 citation statements)

References 24 publications

(15 reference statements)

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“…The resulting SERS spectra are presented in Fig. 7 and they are consistent with the existing literature [53,54,[64][65][66][67]. The SERS spectrum of R6G shows also the N -H in-plane bend mode around 1312 cm -1 in addition to the targeted C -C vibrational stretching at 1363 cm -1 .…”

Section: Resultssupporting

confidence: 87%

“…Plasmonic oligomers were optimized using FEM-based simulations so that their FR would overlap with the targeted Raman signature zones of the analytes (1360 cm -1 for rhodamine 6G [53] and 734 cm -1 for adenine [54]) when excited with the wavelength of the Raman experiment (785 nm). The trimer, depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…To study the effect of FR on the SERS performance of the oligomers, we performed Raman spectroscopy of two Raman active analytes, adenine (Ade) and rhodamine 6G (R6G), on top of the trimers and the pentamers with an excitation at 785 nm. Our targeted Raman bands were the symmetric ring-breathing mode of adenine [54] around 734 cm -1 and C -C stretching mode (vibrational) of rhodamine 6G [53] around 1360 cm -1 . Collected SERS spectra were baselinecorrected using the asymmetric least squares algorithm for the baseline analysis [60] and smoothed using the Savitzky-Golay smoothing technique [61,62], both implemented by a commercially available data analysis software OriginPro 2017 [63].…”

Section: Resultsmentioning

confidence: 99%

“…The strength of FR, which can be identified by the depth of the Fano dip, is higher in the pentamer than in the trimer. The oligomers were numerically modelled using the finite element method (FEM) to tune their FR into the targeted Raman signals of two Raman active analytes, 1360 cm -1 for rhodamine 6G [53], and 734 cm -1 for adenine [54]. Optical characterization of the fabricated oligomers showed agreement with the simulated responses and ensured deeper Fano dip in the pentamer than in the trimer.…”

Section: Introductionmentioning

confidence: 81%

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Influence of Fano resonance on SERS enhancement in Fano-plasmonic oligomers

et al. 2019

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Plasmonic oligomers can provide profound Fano resonance in their scattering responses. The sub-radiant mode of Fano resonance can result in significant near-field enhancement due to its light trapping capability into the so-called hotspots. Appearance of these highly localized hotspots at the excitation and/or Stokes wavelengths of the analytes makes such oligomers promising SERS active substrates. In this work, we numerically and experimentally investigate optical properties of two disk-type gold oligomers, which have different strength and origin of Fano resonance. Raman analysis of rhodamine 6G and adenine with the presence of the fabricated oligomers clearly indicates that an increment in the strength of Fano resonance can improve the Raman enhancement of an oligomer significantly. Therefore, by suitable engineering of Fano lineshape, one can achieve efficient SERS active substrates with spatially localized hotspots.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 81%

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Influence of Fano resonance on SERS enhancement in Fano-plasmonic oligomers

et al. 2019

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“…Though the SERS measurement of R6G, the following Raman peaks of R6G were clearly observed: C-C stretching at 1364 cm −1 , 1510 cm −1 , 1651 cm −1 , N-H in-plane bending at 1310 cm −1 , 1575 cm −1 , C-H in-plane bending at 1130 cm −1 , 1183 cm −1 , C-H out-of-plane bending at 775 cm −1 , C-C-C ring in-plane vibration at 613 cm −1 . These Raman peaks detected through our experiment are closely matches with the characteristic Raman peaks of R6G reported in the literature 98,99. SERS spectra of lower concentrations of R6G inFigure 5 4.…”

supporting

confidence: 89%

Active and Ultrasensitive Chemical and Biosensing through Optothermally Generated Microbubble

Karim

Sun

Vasquez

et al. 2020

Conference on Lasers and Electro-Optics

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Rapid and sensitive detection of harmful chemicals or biological samples is essential for medical study and industrial applications. For example, in the food industry, it is an urgent demand to detect hazardous chemicals or pathogens and then efficiently eliminate contaminated sources from the food production chain to protect people from toxic food-borne infection. In addition, toxic chemicals, pesticides and pathogens are also responsible for water, air and soil contamination. Therefore, rapid and sensitive detection of toxic chemicals or pathogens are very important to ensure food safety and evaluating environmental pollution. Most of the sensing systems for detecting chemical or biological samples apply a passive sensing method, in which binding of analytes to the sensor happens through free diffusion. Due to this free diffusion of analytes in a passive sensing method, diffusing process takes several hours even days, especially when the analytes are at low concentrations and therefore suffer from so called diffusion limit. A higher sensitivity can be achieved in passive sensing methods, with nanoscale sensors but at a cost of reduced speed and vice versa. Therefore, speed and sensitivity of sensing need to be traded off. Active sensing methods, in which analytes are actively concentrated towards the sensor, can be used to break the diffusion limit of sensing and significantly improve the sensitivity. In this work, an ultrasensitive and cost-effective chemical and biosensing platform has been developed under ambient condition to demonstrate active sensing of analytes. This method v works based on an optothermally generated microbubble (OGMB). OGMB is a micronsized bubble that is generated on a liquid-solid interface through laser heating. Due to the strong convective flow induced by OGMB, nanoparticles or analytes can be attracted towards the OGMB and deposited on the surface of a substrate. We have successfully fabricated nanogap-rich structures by generating an OGMB on a glass substrate. The nanoparticles in the nanogap-rich structures form many nanogaps that are ideal for surface enhance Raman scattering (SERS) due to the plasmonic resonance of nanogap-rich structures. Analytes for example any chemical or biological samples can be actively concentrated on the nanogap-rich structure for SERS detection. The OGMB-assisted active sensing method can improve the detection limit of analytes by an order of magnitude compared to that with a passive sensing and thus overcome the diffusion limit of conventional passive sensing methods. Therefore, we expect that, OGMB-assisted active sensing method will find potential applications in advanced chemical and bio-sensing. DEDICATION vi Dedicated to my mother who is my pride, inspiration, strength and my life. vii ACKNOWLEDGMENTS At the beginning, all the praise to Almighty for giving me the capability for successful completion of this work. I would like to express my sincere indebtedness to all who have given me the chance to finish this research. Without their generous sup...

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Aluminum nanostructures for 355 nm surface‐enhanced Raman spectroscopy of fluorescing chemicals

Atanasov,

Nedyalkov,

Dikovska

et al. 2023

J Raman Spectroscopy

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The applications of Raman spectroscopy have been limited by the presence of the fluorescence emitted by some samples. This interference can be depressed by shifting the excitation source used in Raman spectroscopy to the high‐energetic ultraviolet (UV) or deep ultraviolet (DUV) ranges. Plasmon resonance of aluminum (Al) nanostructures can play an important role in surface‐enhanced Raman spectroscopy (SERS) of fluorescence samples. Al active nanostructures have been produced for the first time on the aluminum nitride (AlN) substrates by nanosecond (ns) laser pulses or on fused silica by direct picosecond (ps) laser deposition. The efficiency of the Al active nanostructures produced on AlN for 355 nm SERS was simulated using the finite difference time domain (FDTD) method. The ability of using the Al active nanostructures has been proven for the first time to study rhodamine 6G (R6G) and methylene blue (MB) as probe fluorescing molecules for 355 nm SERS. The SERS spectra at different conditions have also been achieved.

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Surface enhanced Raman spectroscopy of Rhodamine 6G on agglomerates of different-sized silver truncated nanotriangles

Cited by 47 publications

References 24 publications

Influence of Fano resonance on SERS enhancement in Fano-plasmonic oligomers

Influence of Fano resonance on SERS enhancement in Fano-plasmonic oligomers

Active and Ultrasensitive Chemical and Biosensing through Optothermally Generated Microbubble

Aluminum nanostructures for 355 nm surface‐enhanced Raman spectroscopy of fluorescing chemicals

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